A number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.
Endpoint Overrides
GOOGLE_CLOUD_CPP_LOOKUP_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "servicedirectory.googleapis.com") used by MakeLookupServiceConnection().
GOOGLE_CLOUD_CPP_REGISTRATION_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "servicedirectory.googleapis.com") used by MakeRegistrationServiceConnection().
GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also set GOOGLE_CLOUD_CPP_ENABLE_CLOG to produce any output on the program's console.
See Also
google::cloud::LoggingComponentsOptionGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.
See Also
google::cloud::GrpcTracingOptionsOptionGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes: turns on logging in the library, basically the library always "logs" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-14 UTC."],[[["This document provides a comprehensive list of environment variables for configuring the behavior of the C++ Service Directory library, along with links to relevant documentation for each."],["The library supports endpoint overrides for both the Lookup Service and Registration Service via `GOOGLE_CLOUD_CPP_LOOKUP_SERVICE_ENDPOINT` and `GOOGLE_CLOUD_CPP_REGISTRATION_SERVICE_ENDPOINT` variables, respectively."],["Tracing for gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, which provides detailed request and response logging, often in conjunction with the `GOOGLE_CLOUD_CPP_ENABLE_CLOG` variable."],["The document lists a historical set of versions of the service, with `2.37.0-rc` being the latest release candidate, and version `2.35.0` being the default version highlighted on this specific page."],["It also discusses how logging, although always available, can be configured to print via `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes`, and tracing behavior can be altered with `GOOGLE_CLOUD_CPP_TRACING_OPTIONS=...`."]]],[]]
